Automatic reversing method for reciprocating power output

Abstract

The invention discloses an automatic reversing method for reciprocating power output. The method first configures a reversing component, whose power output end is a reciprocating telescopic transmission and whose extension / retraction strokes are the same. The reversing component includes a valve body, a valve core component and a valve stem. One end of the valve stem extends into the valve body and is arranged as a valve stem driving end, and the other end extends out of the valve body and is arranged as a reciprocating transmission end. The valve core component includes a fixed valve core and a movable reversing valve sleeve. An oil inlet hole and an oil drain hole are provided on the rodless cavity of the valve body, an oil inlet channel and an oil drain channel are provided on the fixed valve core, a piston is provided on the valve stem driving end, and an oil inlet hole is provided on the rod cavity of the valve body; a linkage mechanism is provided between the piston and the movable reversing valve sleeve. The reversing structure has the advantages of compact structure, short reversing distance, stable and reliable reversing, smaller reversing pressure difference, greatly improved reversing frequency, almost constant output pressure, and good adaptability to spraying conditions with strict requirements on pressure fluctuations.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic reversing elements, in particular to an automatic reversing method for reciprocating power output. Background Art

[0002] The reversing valve is a directional control valve with more than two flow forms and more than two oil ports. It is a valve that realizes the communication, cutting and reversing of hydraulic oil flow, as well as pressure unloading and sequential action control. The directional control valve that relies on the relative movement of the valve core and the valve body is divided into two types: rotary valve type and sliding valve type. According to the number of working positions where the valve core stays in the valve body, it is divided into two-position and three-position; according to the number of oil circuits connected to the valve body, it is divided into two-way, three-way, four-way and six-way; the way to operate the valve core movement is manual, motorized, electric, hydraulic, electro-hydraulic and other types. The reversing valve is a directional control valve with more than two flow forms and more than two oil ports. It is a valve that realizes the communication, cutting and reversing of hydraulic oil flow, as well as pressure unloading and sequential action control.

[0003] At present, the hydraulic reversing mechanism is mostly sealed by plastic and rubber seals, and the internal components have a large reversing stroke, a large reversing pressure difference, a low reversing frequency of the cylinder rod, and it is difficult to maintain a stable output pressure. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a hydraulic power automatic reversing component with a small structural volume, short reversing distance, short reversing stroke and smaller reversing pressure difference, which can maintain a high reversing frequency and almost constant output pressure.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solution: an automatic reversing method for reciprocating power output, the reversing method comprising:

[0006] (1) A reversing assembly is configured, wherein the power output end is a reciprocating telescopic transmission and the extension / retraction strokes are the same, and the power output end is transmission-connected to the power input end of an external transmission device. The reversing assembly comprises a valve body, a valve core assembly and a valve stem, wherein one end of the valve stem extends into the valve body and is configured as a valve stem driving end, and the other end extends out of the valve body and is configured as a reciprocating driving end. The valve stem driving end divides the interior of the valve body into a rod chamber and a rodless chamber, and the valve core assembly is located in the rodless chamber of the valve body;

[0007] The valve core assembly includes a fixed valve core and a movable reversing valve sleeve, an oil inlet hole and an oil drain hole are provided on the rodless cavity of the valve body, an oil inlet channel and an oil drain channel which are normally connected with the oil inlet hole and the oil drain hole are provided on the fixed valve core, and the movable reversing valve sleeve is sleeved on the outer peripheral surface of the fixed valve core;

[0008] A piston is arranged on the driving end of the valve stem, and an oil inlet hole is opened on the valve body with a rod cavity. The oil inlet holes of the valve body without a rod cavity and the valve body with a rod cavity are simultaneously filled with oil to form a pressure difference on both sides of the piston;

[0009] A linkage mechanism is arranged between the piston and the movable reversing valve sleeve, and the linkage mechanism comprises a driving rod, a driving groove and a driving block;

[0010] The driving groove is provided on the driving end of the valve stem;

[0011] One end of the driving rod penetrates the piston and then extends into the driving groove and is set as the driving end, and the other end is fixed on the movable reversing valve sleeve;

[0012] The driving block is mounted on the driving end of the driving rod;

[0013] The piston is pushed by the pressure difference formed on both sides of the piston.

[0014] An abutment block is provided between the piston and the driving rod. When the piston reaches the oil leakage stop point, the driving block can be pushed by continuing to supply oil, so that the movable reversing valve sleeve can block the oil inlet channel of the stationary valve core. The abutment block is fixed on the inner circumferential surface of the piston and penetrated by the driving rod. When the piston reaches the oil leakage stop point, the abutment block abuts against the driving block.

[0015] The driving groove is provided with an abutment platform for pushing the driving block when the piston reaches the oil inlet stop point by continuing to supply oil, so that the movable reversing valve sleeve blocks the oil leakage channel of the stationary valve core, and the abutment platform abuts against the driving block when the piston reaches the oil inlet stop point;

[0016] (2) Configure the hydraulic system, which includes the oil inlet pipeline and the oil return pipeline;

[0017] The oil inlet pipeline includes an oil inlet main pipe and two oil inlet branch pipes, one end of the two oil inlet branch pipes is connected in parallel to the oil inlet main pipe, and the other end is connected to the oil inlet hole of the valve body with a rod cavity and the oil inlet hole of the valve body without a rod cavity respectively;

[0018] The oil return pipeline comprises an oil return pipe, one end of which is connected to the oil drain hole of the rodless cavity of the valve body, and the other end is connected to the oil tank.

[0019] Preferably, the valve body is composed of a valve body without a rod cavity shell, a valve body with a rod cavity shell and an intermediate shell;

[0020] The oil inlet hole and the oil drain hole connected with the oil inlet channel / oil drain channel of the fixed valve core are both located on the outer shell of the rodless cavity of the valve body;

[0021] A through hole is provided on the outer shell of the valve body rod cavity to facilitate the extension and retraction of the valve stem reciprocating transmission end;

[0022] The outer peripheral surface of one end of the intermediate shell is fixedly connected to the inner peripheral surface of the valve body rodless cavity shell, and the outer peripheral surface of the other end is fixedly connected to the inner peripheral surface of the valve body rod cavity shell.

[0023] Preferably, a limiting mechanism is provided between the valve body and the movable reversing valve sleeve for limiting the movable reversing valve sleeve when the piston has not reached the dead point position, so that the movable reversing valve sleeve maintains the current continuous blocking of the fixed valve core oil inlet channel or the fixed valve core oil drain channel.

[0024] Preferably, the limiting mechanism comprises a limiting groove and an elastic member;

[0025] The limiting groove is arranged on the outer peripheral surface of the movable reversing valve sleeve, and two limiting grooves are provided;

[0026] One end of the elastic member abuts against the limiting groove, and the other end is connected to the inner peripheral surface of the rodless cavity of the valve body;

[0027] The distance between the two limit grooves is equal to the axial stroke of the movable reversing valve sleeve during the period when the movable reversing valve sleeve successively blocks the oil inlet channel of the fixed valve core or the oil drain channel of the fixed valve core.

[0028] Preferably, the elastic member comprises a plug, an elastic element and a sphere;

[0029] The plug is screwed onto the inner peripheral surface of the rodless cavity of the valve body;

[0030] The plug has a blind hole on one end surface facing the movable reversing valve sleeve, one end of the elastic element is placed in the blind hole, and the other end is fixedly connected to the ball and abuts the ball against the limiting groove.

[0031] Preferably, a valve body rod chamber oil inlet clearance is provided on the inner circumferential surface of the valve body rod chamber to facilitate the fluid in the valve body rod chamber oil inlet hole to enter the valve body rod chamber, and a valve body rodless chamber oil leakage clearance is provided on the inner circumferential surface of the valve body rodless chamber to facilitate the fluid in the valve body rodless chamber to enter the stationary valve core oil leakage channel.

[0032] Preferably, the movable reversing valve sleeve has a cavity, the outlet end of the oil inlet channel on the fixed valve core is connected to the cavity in the movable reversing valve sleeve, and a fluid hole is provided on the movable reversing valve sleeve to facilitate the fluid in the reversing valve sleeve cavity to enter the rodless cavity of the valve body.

[0033] Preferably, the driving block is composed of a fixed driving block, a movable driving block and an elastic element;

[0034] The fixed driving block is fixed on the outer peripheral surface of the driving end of the driving rod;

[0035] The movable driving block is sleeved on the outer peripheral surface of the driving rod and can move along the axial direction of the driving rod;

[0036] One end of the elastic element is fixedly connected to the end surface of the fixed driving block, and the other end is fixedly connected to the end surface of the movable driving block;

[0037] When the piston reaches the oil leakage stop point, the abutment block abuts against the movable driving block, and the movable driving block abuts against the fixed driving block after compressing the elastic element. When the piston reaches the oil inlet stop point, the abutment platform abuts against the fixed driving block.

[0038] Preferably, the axis of the drive groove is colinear with the axis of the valve stem.

[0039] Preferably, the flow cross-sectional area of ​​the fluid in the rod cavity of the valve body is smaller than the flow cross-sectional area of ​​the fluid in the rodless cavity of the valve body.

[0040] Compared with the prior art, the beneficial technical effects of the present invention are:

[0041] (1) The reversing structure has the advantages of compact structure, short reversing distance, stable and reliable reversing, lower manufacturing cost, and the reversing components abandon traditional seals such as plastic and rubber. The seal is more reliable and is not affected by high oil temperature. It can be used in harsh working conditions such as high ambient temperature. Due to the short reversing distance, the reversing pressure difference is smaller, the reversing frequency is greatly improved, and the output pressure is almost constant. It has good adaptability to spraying conditions with strict pressure fluctuation requirements.

[0042] (2) The valve stem can achieve reciprocating motion through the valve core assembly and linkage mechanism, meeting the working requirements of uninterrupted operation of the reciprocating transmission end of the valve stem.

[0043] (3) The valve stem has automatic reversing. Compared with the traditional electromagnetic reversing valve, the purely mechanical type is more reliable and does not require an external power supply to control the reversing. It can be widely used in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the full cross-section structure when the oil leakage channel of the fixed valve core of the reversing component is blocked;

[0045] Figure 2 Another schematic diagram of the full cross-section structure when the oil leakage passage of the fixed valve core of the reversing component is blocked;

[0046] Figure 3 It is a schematic diagram of the full cross-section structure when the oil inlet passage of the fixed valve core of the reversing component is blocked;

[0047] Figure 4 It is a schematic diagram of the full cross-section structure when the oil inlet passage of the fixed valve core of the reversing component is blocked;

[0048] Figure 5 for Figure 1 A partial enlarged structural diagram of the piston part;

[0049] Figure 6 for Figure 1 A partial enlarged structural diagram of the valve core assembly;

[0050] Figure 7 for Figure 2 A partial enlarged structural diagram of the valve core assembly.

[0051] In the figure, 1, valve body; 2, valve stem driving end; 3, reciprocating transmission end; 4, valve body rodless cavity; 5, fixed valve core; 6, movable reversing valve sleeve; 71, oil inlet hole; 72, oil inlet hole; 8, oil drain hole; 9, oil inlet channel; 10, oil drain channel; 11, piston; 12, driving groove; 13, driving rod driving end; 14, abutment block; 15, abutment platform; 16, limit groove; 17, plug; 181, elastic element; 182, elastic element; 19, ball; 20, valve body rod cavity oil inlet gap; 21, valve body rodless cavity oil drain gap; 22, fluid hole; 23, fixed driving block; 24, movable driving block; 25, valve body rod cavity; 26, oil inlet main pipe; 27, oil inlet branch pipe; 28, oil return pipe. DETAILED DESCRIPTION

[0052] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute a limitation on the rights thereof.

[0053] Example 1, reference Figure 1-7 , an automatic reversing method for reciprocating power output, the reversing method comprising,

[0054] (1) A reversing assembly is configured, wherein the power output end is a reciprocating telescopic transmission and the extension / retraction strokes are the same, and the power output end is connected to the power input end of an external transmission device, wherein the power output end is the reciprocating transmission end 3 described below, and the reversing assembly comprises a valve body, a valve core assembly and a valve stem, wherein one end of the valve stem extends into the valve body and is configured as a valve stem driving end, and the other end extends out of the valve body and is configured as a reciprocating transmission end, and the valve stem driving end divides the interior of the valve body into a rod chamber and a rodless chamber, and the valve core assembly is located in the rodless chamber of the valve body;

[0055] It includes a valve body 1, a valve core assembly and a valve stem. The axes of the valve body 1 and the valve stem are collinear. One end of the valve stem extends into the valve body 1 and is set as a valve stem driving end 2, and the other end extends out of the valve body 1 and is set as a reciprocating transmission end 3. The reciprocating transmission end 3 can be connected to an external workpiece / component that requires a reciprocating transmission connection. The valve body 1 is divided into a rod chamber and a rodless chamber by the valve stem driving end 2. The valve core assembly is located in the rodless chamber 4 of the valve body.

[0056] The valve core assembly includes a fixed valve core 5 and a movable reversing valve sleeve 6, an oil inlet hole 71 and an oil drain hole 8 are provided on the valve body rodless chamber 4, and an oil inlet channel 9 and an oil drain channel 10 which are always connected with the oil inlet hole 71 and the oil drain hole 8 are provided on the fixed valve core 5, that is, the oil inlet / drain hole 8 of the fixed valve core 5 is always connected with the oil inlet channel 9 and the oil drain channel 10, and the movable reversing valve sleeve 6 is sleeved on the outer peripheral surface of the fixed valve core 5, that is, the movable reversing valve sleeve 6 can move along the axis of the fixed valve core 5;

[0057] A piston 11 is provided on the valve stem driving end 2. A sealing ring is provided on the outer circumference of the piston 11 to improve the sealing performance between the piston 11 and the inner circumference of the valve body 1. An oil inlet hole 72 is provided on the valve body rod cavity 25. The oil inlet holes of the valve body rodless cavity 4 and the valve body rod cavity 25 are simultaneously filled with oil to form a pressure difference on both sides of the piston 11.

[0058] A linkage mechanism is provided between the piston 11 and the movable reversing valve sleeve 6, and the linkage mechanism includes a driving rod, a driving groove 12 and a driving block;

[0059] The driving groove 12 is provided on the valve stem driving end 2. The cross section of the driving groove 12 can be circular, and its size can be selected according to the use requirements.

[0060] One end of the driving rod passes through the piston 11 and extends into the driving groove 12 and is set as the driving end, and the other end is fixed on the movable reversing valve sleeve 6. The cross section of the driving rod can be circular, and its size specifications can be selected according to the use requirements;

[0061] The driving block is fixed on the driving end 13 of the driving rod;

[0062] The piston 11 is pushed by the pressure difference formed on both sides of the piston 11.

[0063] An abutment block 14 is provided between the piston 11 and the driving rod. When the piston 11 reaches the oil drain stop point, the driving block can be pushed by continuing to supply oil, so that the movable reversing valve sleeve 6 blocks the oil inlet passage 9 of the fixed valve core 5. The abutment block 14 can be formed into a cylindrical structure with a through middle. Its shape and size can be selected according to the use requirements. The abutment block 14 is fixed on the inner circumferential surface of the piston 11 and penetrated by the driving rod. When the piston 11 reaches the oil drain stop point, the abutment block 14 abuts on the driving block.

[0064] The driving groove 12 is provided with an abutment platform 15 for the piston 11 to reach the oil inlet stop point and continue to supply oil to push the driving block, so that the movable reversing valve sleeve 6 blocks the oil leakage channel 10 of the immovable valve core 5. The abutment platform 15 can be formed as a truncated cone plane with an inner diameter smaller than the radial size of the abutment block 14. The shape and size of the abutment platform 15 can be selected according to the use requirements. The design purpose of the abutment platform 15 is only to push the abutment block 14. When the piston 11 reaches the oil inlet stop point, the abutment platform 15 abuts on the driving block.

[0065] (2) Configure the hydraulic system, which includes the oil inlet pipeline and the oil return pipeline;

[0066] The oil inlet pipeline includes an oil inlet main pipe 26 and two oil inlet branch pipes 27. One end of the two oil inlet branch pipes 27 is connected in parallel to the oil inlet main pipe 26, and the other end is connected to the oil inlet hole 72 of the valve body with a rod cavity and the oil inlet hole 71 of the valve body without a rod cavity.

[0067] The oil return pipeline includes an oil return pipe 28, one end of which is connected to the oil drain hole 8 of the rodless chamber of the valve body, and the other end is connected to the oil tank.

[0068] Embodiment 2, an automatic reversing method for reciprocating power output as described in embodiment 1, wherein the valve body is composed of a valve body rodless cavity shell, a valve body rod cavity shell and an intermediate shell connected together;

[0069] The oil inlet hole and the oil drain hole connected with the oil inlet channel / oil drain channel of the fixed valve core are both located on the outer shell of the rodless cavity of the valve body;

[0070] A through hole is provided on the outer shell of the valve body rod cavity to facilitate the extension and retraction of the valve stem reciprocating transmission end;

[0071] The outer peripheral surface of one end of the intermediate shell is fixedly connected to the inner peripheral surface of the valve body rodless cavity shell, and the outer peripheral surface of the other end is fixedly connected to the inner peripheral surface of the valve body rod cavity shell.

[0072] Embodiment 3, an automatic reversing method for reciprocating power output described in Embodiment 1, is provided with a limiting mechanism between the valve body 1 and the movable reversing valve sleeve 6 for limiting the movable reversing valve sleeve 6 when the piston 11 has not reached the dead point position, so that the movable reversing valve sleeve 6 maintains the current continuous blocking of the oil inlet channel 9 of the fixed valve core 5 or the oil drain channel 10 of the fixed valve core 5.

[0073] In Example 3, the limiting mechanism is designed to limit the position of the movable reversing valve sleeve 6 when the piston 11 has not reached the dead point, so that it can maintain the current continuous blocking of the oil inlet channel 9 or the oil drain channel 10 of the fixed valve core 5.

[0074] Embodiment 4, the automatic reversing method of reciprocating power output described in Embodiment 3, wherein the limiting mechanism comprises a limiting groove 16 and an elastic member;

[0075] The limiting groove 16 is provided on the outer peripheral surface of the movable reversing valve sleeve 6. Two limiting grooves 16 are provided. The limiting groove 16 can be an annular groove with a semicircular cross section. The shape and size thereof can be selected according to the use requirements.

[0076] One end of the elastic member abuts against the limiting groove 16, and the other end is connected to the inner peripheral surface of the rodless cavity 4 of the valve body;

[0077] The distance between the two limit grooves 16 is equal to the axial stroke of the movable reversing valve sleeve 6 during the period when the movable reversing valve sleeve 6 successively blocks the oil inlet channel 9 of the fixed valve core 5 or the oil leakage channel 10 of the fixed valve core 5. That is to say, when the movable reversing valve sleeve 6 switches to block the oil inlet channel 9 of the fixed valve core 5 or the oil leakage channel 10 of the fixed valve core 5, the axial stroke of the movable reversing valve sleeve 6 is equal to the axial distance between the two limit grooves 16.

[0078] Embodiment 5, an automatic reversing method for reciprocating power output as described in Embodiment 4, wherein the elastic member comprises a plug 17, an elastic element 181 and a ball 19;

[0079] The plug 17 is screwed on the inner circumference of the rodless cavity of the valve body 1. The plug 17 is a prior art, and its size and model can be selected according to practical technology.

[0080] The plug 17 has a blind hole on one end surface facing the movable reversing valve sleeve 6. One end of the elastic element 181 is placed in the blind hole, and the other end is fixedly connected to the ball 19 and abuts the ball 19 against the limiting groove 16. The elastic element 181 can be a spring.

[0081] Embodiment 6, an automatic reversing method for reciprocating power output as described in Embodiment 1, a valve body rod chamber oil inlet gap 20 is provided on the inner circumferential surface of the valve body rod chamber 25 to facilitate the fluid in the valve body rod chamber oil inlet hole 72 to enter the valve body rod chamber 25, and a valve body rodless chamber oil drain gap 21 is provided on the inner circumferential surface of the valve body rodless chamber 4 to facilitate the fluid in the valve body rodless chamber 4 to enter the stationary valve core 5 oil drain channel 10.

[0082] In Example 6, the sizes of the oil inlet gap 20 of the valve body with a rod cavity and the oil drain gap 21 of the valve body without a rod cavity can be selected according to the use requirements, and the design purpose is only to facilitate the circulation of fluid.

[0083] Embodiment 7, an automatic reversing method for reciprocating power output as described in Embodiment 6, the movable reversing valve sleeve 6 has a cavity, the outlet end of the oil inlet channel 9 on the fixed valve core 5 is connected to the cavity in the movable reversing valve sleeve 6, and a fluid hole 22 is provided on the movable reversing valve sleeve 6 to facilitate the fluid in the reversing valve sleeve cavity to enter the rodless cavity 4 of the valve body. The fluid hole 22 can be a circular hole, and the number and size of the fluid hole 22 can be selected according to the use requirements.

[0084] Embodiment 8, a reciprocating power output automatic reversing method as described in Embodiment 1, wherein the driving block is composed of a fixed driving block 23, a movable driving block 24 and an elastic element 182, and the fixed driving block 23 and the movable driving block 24 can be a multi-step tubular structure with a through hole in the middle, which can be selected according to the use requirements;

[0085] The fixed driving block 23 is fixed on the outer peripheral surface of the driving end 13 of the driving rod;

[0086] The movable driving block 24 is sleeved on the outer peripheral surface of the driving rod and can move along the axial direction of the driving rod;

[0087] One end of the elastic element 182 is fixedly connected to the end surface of the fixed driving block 23, and the other end is fixedly connected to the end surface of the movable driving block 24. The elastic element 182 can be a spring.

[0088] When the piston 11 reaches the oil leakage stop point, the abutment block 14 abuts against the movable driving block 24, and the movable driving block 24 abuts against the fixed driving block 23 after compressing the elastic element 182. When the piston 11 reaches the oil inlet stop point, the abutment platform 15 abuts against the fixed driving block 23.

[0089] Embodiment 9, an automatic reversing method for reciprocating power output as described in Embodiment 1, wherein the axis of the drive groove 12 is colinear with the axis of the valve stem.

[0090] Embodiment 10, an automatic reversing method for reciprocating power output as described in embodiments 1-9, wherein the flow cross-sectional area of ​​the fluid in the rod chamber 25 of the valve body is smaller than the flow cross-sectional area of ​​the fluid in the rodless chamber 4 of the valve body.

[0091] The reversing process of the automatic reversing component is:

[0092] (1) When the valve stem reciprocating drive end 3 is in the extended state:

[0093] At this time, the movable reversing valve sleeve 6 blocks the oil leakage channel 10 of the stationary valve core 5. Since the flow cross-sectional area of ​​the fluid in the valve body rod chamber 25 is smaller than the flow cross-sectional area of ​​the fluid in the valve body rodless chamber 4, that is to say, during the oil supply from the oil tank to the oil inlet main pipe 26, the fluid enters the valve body rod chamber 25 and the valve body rodless chamber 4 respectively through the oil inlet branch pipe 27. At this time, the oil pressure in the valve body rodless chamber 4 is greater than the oil pressure in the valve body rod chamber 25. The fluid in the valve body rodless chamber 4 compresses the fluid in the valve body rod chamber 25 through the piston 11, so that the fluid in the valve body rod chamber 25 is pressed out of the oil inlet hole 72 on the valve body rod chamber 25. The pressed fluid will When the oil flows back to the oil inlet main pipe 26, when the piston 11 is pushed further until the oil leakage stop point is reached, the oil supply continues to cause the abutment block 14 to abut against the drive block and push the drive block. The pushing direction is the extension direction of the valve stem reciprocating drive end 3, which is also the direction away from the valve core assembly. Since the drive block, the drive rod and the movable reversing valve sleeve 6 are fixedly connected, when the drive block is pushed, the movable reversing valve sleeve 6 will also move, so that the movable reversing valve sleeve 6 no longer blocks the oil leakage channel 10 of the fixed valve core 5, and blocks the oil inlet channel 9 of the fixed valve core 5, and completes the extension stroke of the valve stem reciprocating drive end 3;

[0094] When the valve stem reciprocating drive end 3 changes from the extended state to the contracted state:

[0095] Since the movable reversing valve sleeve 6 blocks the oil inlet passage 9 of the fixed valve core 5, when oil is simultaneously introduced into the valve body rod chamber 25 and the valve body rodless chamber 4, since the outlet end of the oil inlet passage 9 of the fixed valve core 5 is blocked by the inner circumferential surface of the movable reversing valve sleeve 6, new fluid cannot enter the valve body rodless chamber 4. Since the volume of the fluid in the valve body rod chamber 25 continues to increase, the fluid in the valve body rod chamber 25 pushes the piston 11 to push and compress the fluid in the valve body rodless chamber 4. Since the oil drain passage 10 on the fixed valve core 5 is no longer blocked by the movable reversing valve sleeve 6, the fluid in the valve body rodless chamber 4 pushed and compressed by the piston 11 enters the fixed valve core 5 through the valve body rodless chamber oil drain gap 21. The oil is discharged from the oil drain channel 10 of the valve body and discharged from the oil drain hole 8 on the rodless chamber 4 of the valve body. The discharged fluid finally flows back to the oil tank through the return oil pipe 28. During this period, the valve stem reciprocating transmission end 3 is always in a contracted state. When the piston 11 reaches the oil inlet stop point, the abutment platform 15 abuts on the drive block, and the continued fluid supply state of the valve body rod chamber 25 can make the abutment platform 15 push the drive block. Since the drive block, the drive rod and the movable reversing valve sleeve 6 are fixedly connected, when the drive block is pushed, the movable reversing valve sleeve 6 will also move, so that the movable reversing valve sleeve 6 no longer blocks the oil inlet channel 9 of the fixed valve core 5, and blocks the oil drain channel 10 of the fixed valve core 5, and completes the contraction stroke of the valve stem reciprocating transmission end 3;

[0096] By simultaneously supplying oil to the valve body rod chamber 25 and the valve body rodless chamber 4, the valve stem reciprocating drive end 3 can be continuously extended or contracted by the rated stroke, and the reciprocating drive of the valve stem reciprocating drive end 3 can be achieved;

[0097] It should be noted that when the piston 11 has not reached the dead center position, that is, the abutment block 14 has not abutted against the driving block or the abutment platform 15 has not abutted against the driving block, at this time, the ball 19 is always abutting against the limiting groove 16 on the outer peripheral surface of the movable reversing valve sleeve 6, and limits the movable reversing valve sleeve 6 so that it maintains the current state of continuously blocking the oil inlet channel 9 of the fixed valve core 5 or the oil leakage channel 10 of the fixed valve core 5. When the piston 11 reaches the dead center position and makes the movable reversing valve sleeve 6 switch to block the oil inlet channel 9 or the oil leakage channel 10 of the fixed valve core 5, at this time, the ball 19 will naturally abut against another limiting groove 16 and limit the movable reversing valve sleeve again.

Claims

1. An automatic reversing method for reciprocating power output, Features: The steps of the commutation method are: (1) A reversing assembly is configured, wherein the power output end is a reciprocating telescopic transmission and the extension / retraction strokes are the same, and the power output end is transmission-connected to the power input end of an external transmission device. The reversing assembly comprises a valve body, a valve core assembly and a valve stem, wherein one end of the valve stem extends into the valve body and is configured as a valve stem driving end, and the other end extends out of the valve body and is configured as a reciprocating driving end. The valve stem driving end divides the interior of the valve body into a rod chamber and a rodless chamber, and the valve core assembly is located in the rodless chamber of the valve body; The valve core assembly includes a fixed valve core and a movable reversing valve sleeve, an oil inlet hole and an oil drain hole are provided on the rodless cavity of the valve body, an oil inlet channel and an oil drain channel which are normally connected with the oil inlet hole and the oil drain hole are provided on the fixed valve core, and the movable reversing valve sleeve is sleeved on the outer peripheral surface of the fixed valve core; A piston is arranged on the driving end of the valve stem, and an oil inlet hole is opened on the valve body with a rod cavity. The oil inlet holes of the valve body without a rod cavity and the valve body with a rod cavity are simultaneously filled with oil to form a pressure difference on both sides of the piston; A linkage mechanism is arranged between the piston and the movable reversing valve sleeve, and the linkage mechanism comprises a driving rod, a driving groove and a driving block; The driving groove is provided on the driving end of the valve stem; One end of the driving rod penetrates the piston and then extends into the driving groove and is set as the driving end, and the other end is fixed on the movable reversing valve sleeve; The driving block is mounted on the driving end of the driving rod; The piston is pushed by the pressure difference formed on both sides of the piston. An abutment block is provided between the piston and the driving rod. When the piston reaches the oil leakage stop point, the driving block can be pushed by continuing to supply oil, so that the movable reversing valve sleeve can block the oil inlet channel of the stationary valve core. The abutment block is fixed on the inner circumferential surface of the piston and penetrated by the driving rod. When the piston reaches the oil leakage stop point, the abutment block abuts against the driving block. The driving groove is provided with an abutment platform for pushing the driving block when the piston reaches the oil inlet stop point by continuing to supply oil, so that the movable reversing valve sleeve blocks the oil leakage channel of the stationary valve core, and the abutment platform abuts against the driving block when the piston reaches the oil inlet stop point; (2) Configure the hydraulic system, which includes the oil inlet pipeline and the oil return pipeline; The oil inlet pipeline includes an oil inlet main pipe and two oil inlet branch pipes, one end of the two oil inlet branch pipes is connected in parallel to the oil inlet main pipe, and the other end is connected to the oil inlet hole of the valve body with a rod cavity and the oil inlet hole of the valve body without a rod cavity respectively; The oil return pipeline comprises an oil return pipe, one end of which is connected to the oil drain hole of the rodless cavity of the valve body, and the other end is connected to the oil tank.

2. The automatic reversing method of a reciprocating power output according to claim 1, Features: The valve body is composed of a valve body without a rod cavity shell, a valve body with a rod cavity shell and an intermediate shell; The oil inlet hole and the oil drain hole communicated with the oil inlet channel / oil drain channel of the fixed valve core are both located on the outer shell of the rodless cavity of the valve body; A through hole is provided on the outer shell of the valve body rod cavity to facilitate the extension and retraction of the valve stem reciprocating transmission end; One end outer circumference of the intermediate shell is fixedly connected to the inner circumference of the valve body rodless cavity shell, and the other end outer circumference is fixedly connected to the inner circumference of the valve body rod cavity shell.

3. The automatic reversing method of a reciprocating power output according to claim 1, Features: A limiting mechanism is provided between the valve body and the movable reversing valve sleeve for limiting the movable reversing valve sleeve when the piston does not reach the dead point position, so that the movable reversing valve sleeve maintains the current continuous blocking of the fixed valve core oil inlet channel or the fixed valve core oil drain channel.

4. The automatic reversing method of a reciprocating power output according to claim 3, Features: The limiting mechanism comprises a limiting groove and an elastic member; The limiting groove is arranged on the outer peripheral surface of the movable reversing valve sleeve, and two limiting grooves are provided; One end of the elastic member abuts against the limiting groove, and the other end is connected to the inner peripheral surface of the rodless cavity of the valve body; The distance between the two limit grooves is equal to the axial stroke of the movable reversing valve sleeve during the period when the movable reversing valve sleeve successively blocks the oil inlet channel of the fixed valve core or the oil drain channel of the fixed valve core.

5. The automatic reversing method of a reciprocating power output according to claim 4, Features: The elastic member comprises a plug, an elastic element and a sphere; The plug is screwed onto the inner peripheral surface of the rodless cavity of the valve body; The plug has a blind hole on one end surface facing the movable reversing valve sleeve, one end of the elastic element is placed in the blind hole, and the other end is fixedly connected to the ball and abuts the ball against the limiting groove.

6. The automatic reversing method of a reciprocating power output according to claim 1, Features: A valve body rod chamber oil inlet clearance is provided on the inner circumferential surface of the valve body rod chamber to facilitate the fluid in the valve body rod chamber oil inlet hole to enter the valve body rod chamber, and a valve body rodless chamber oil leakage clearance is provided on the inner circumferential surface of the valve body rodless chamber to facilitate the fluid in the valve body rodless chamber to enter the stationary valve core oil leakage channel.

7. The automatic reversing method of a reciprocating power output according to claim 6, Features: The movable reversing valve sleeve has a cavity, the outlet end of the oil inlet channel on the fixed valve core is connected to the cavity in the movable reversing valve sleeve, and a fluid hole is opened on the movable reversing valve sleeve to facilitate the fluid in the cavity of the reversing valve sleeve to enter the rodless cavity of the valve body.

8. The automatic reversing method of a reciprocating power output according to claim 1, Features: The driving block is composed of a fixed driving block, a movable driving block and an elastic element; The fixed driving block is fixed on the outer peripheral surface of the driving end of the driving rod; The movable driving block is sleeved on the outer peripheral surface of the driving rod and can move along the axial direction of the driving rod; One end of the elastic element is fixedly connected to the end surface of the fixed driving block, and the other end is fixedly connected to the end surface of the movable driving block; When the piston reaches the oil leakage stop point, the abutment block abuts against the movable driving block, and the movable driving block abuts against the fixed driving block after compressing the elastic element. When the piston reaches the oil inlet stop point, the abutment platform abuts against the fixed driving block.

9. The automatic reversing method of a reciprocating power output according to claim 1, Features: The axis of the driving groove is colinear with the axis of the valve stem.

10. An automatic reversing method for reciprocating power output according to any one of claims 1 to 9, Features: The flow cross-sectional area of ​​the fluid in the valve body with rod cavity is smaller than the flow cross-sectional area of ​​the fluid in the valve body without rod cavity.

Images